TS SDK e2e fixes (MystenLabs#15048)

## Description 

Describe the changes or additions included in this PR.

## Test Plan 

How did you test the new or updated feature?

---
If your changes are not user-facing and not a breaking change, you can
skip the following section. Otherwise, please indicate what changed, and
then add to the Release Notes section as highlighted during the release
process.

### Type of Change (Check all that apply)

- [ ] protocol change
- [ ] user-visible impact
- [ ] breaking change for a client SDKs
- [ ] breaking change for FNs (FN binary must upgrade)
- [ ] breaking change for validators or node operators (must upgrade
binaries)
- [ ] breaking change for on-chain data layout
- [ ] necessitate either a data wipe or data migration

### Release notes

.github/actions/ts-e2e/action.yml

@@ -56,6 +56,9 @@ runs:
     - name: Install dependencies
       run: pnpm install --frozen-lockfile
       shell: bash
+    - name: Build explorer
+      run: pnpm turbo --filter=sui-explorer build
+      shell: bash
     - name: Install Playwright Browsers
       run: pnpm explorer playwright install --with-deps chromium
       shell: bash